/*
 * Copyright (c) 2018-2020 "Graph Foundation,"
 * Graph Foundation, Inc. [https://graphfoundation.org]
 *
 * This file is part of ONgDB.
 *
 * ONgDB is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
/*
 * Copyright (c) 2002-2020 "Neo4j,"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.shell.impl;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;

import org.neo4j.shell.Console;

/**
 * Uses System.in and System.out
 */
public class StandardConsole implements Console
{
    private BufferedReader consoleReader;

    /**
     * Prints a formatted string to the console (System.out).
     * @param format the string/format to print.
     * @param args values used in conjunction with {@code format}.
     */
    @Override
    public void format( String format, Object... args )
    {
        System.out.print( format );
    }

    /**
     * @return the next line read from the console (user input).
     */
    @Override
    public String readLine( String prompt )
    {
        try
        {
            format( prompt );
            if ( consoleReader == null )
            {
                consoleReader = new BufferedReader( new InputStreamReader( System.in, StandardCharsets.UTF_8 ) );
            }
            return consoleReader.readLine();
        }
        catch ( IOException e )
        {
            throw new RuntimeException( e );
        }
    }
}
